Divergent Adsorption Behavior Controlled by Primary Coordination Sphere Anions in the Metal–Organic Framework Ni2X2BTDD

2021 ◽  
Author(s):  
Julius J. Oppenheim ◽  
Jenna L. Mancuso ◽  
Ashley M. Wright ◽  
Adam J. Rieth ◽  
Christopher H. Hendon ◽  
...  
Keyword(s):  
Coordination Sphere ◽  
Metal Organic Framework ◽  
Adsorption Behavior ◽  
Metal Organic ◽  
Organic Framework

scholarly journals The impact of crystal size and temperature on the adsorption-induced flexibility of the Zr-based metal–organic framework DUT-98

2019 ◽  
Vol 10 ◽  
pp. 1737-1744 ◽  
Author(s):  
Simon Krause ◽  
Volodymyr Bon ◽  
Hongchu Du ◽  
Rafal E Dunin-Borkowski ◽  
Ulrich Stoeck ◽  
...  
Keyword(s):  
Crystal Size ◽  
Metal Organic Framework ◽  
Adsorption Behavior ◽  
Switching Behavior ◽  
Type I ◽  
X Ray Diffraction ◽  
X Ray ◽  
Metal Organic ◽  
The Impact ◽  
Organic Framework

In this contribution we analyze the influence of adsorption cycling, crystal size, and temperature on the switching behavior of the flexible Zr-based metal–organic framework DUT-98. We observe a shift in the gate-opening pressure upon cycling of adsorption experiments for micrometer-sized crystals and assign this to a fragmentation of the crystals. In a series of samples, the average crystal size of DUT-98 crystals was varied from 120 µm to 50 nm and the obtained solids were characterized by X-ray diffraction, infrared spectroscopy, as well as scanning and transmission electron microscopy. We analyzed the adsorption behavior by nitrogen and water adsorption at 77 K and 298 K, respectively, and show that adsorption-induced flexibility is only observed for micrometer-sized crystals. Nanometer-sized crystals were found to exhibit reversible type I adsorption behavior upon adsorption of nitrogen and exhibit a crystal-size-dependent steep water uptake of up to 20 mmol g−1 at 0.5 p/p 0 with potential for water harvesting and heat pump applications. We furthermore investigate the temperature-induced structural transition by in situ powder X-ray diffraction. At temperatures beyond 110 °C, the open-pore state of the nanometer-sized DUT-98 crystals is found to irreversibly transform to a closed-pore state. The connection of crystal fragmentation upon adsorption cycling and the crystal size dependence of the adsorption-induced flexibility is an important finding for evaluation of these materials in future adsorption-based applications. This work thus extends the limited amount of studies on crystal size effects in flexible MOFs and hopefully motivates further investigations in this field.

Adsorption behavior of methyl orange onto an aluminum-based metal organic framework, MIL-68(Al)

2017 ◽  
Vol 75 (12) ◽  
pp. 2800-2810 ◽  
Author(s):  
Shi-chuan Wu ◽  
Xia You ◽  
Cao Yang ◽  
Jian-hua Cheng
Keyword(s):  
Methyl Orange ◽  
Adsorption Isotherm ◽  
Electrostatic Interactions ◽  
Metal Organic Framework ◽  
Dye Adsorption ◽  
Adsorption Behavior ◽  
Metal Organic ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order ◽  
Organic Framework

MIL-68(Al), a powdered aluminum-based metal organic framework (MOF), was synthesized and used to explore its adsorption behavior toward methyl orange (MO). The adsorption isotherm, thermodynamics, kinetics, and some key operating factors as well as changes in the material's structure were investigated. The adsorption isotherm conformed to the Langmuir isotherm model and the maximum equilibrium adsorption capacity was 341.30 mg g−1. Thermodynamic data demonstrated that the adsorption process was spontaneous, endothermic and showed positive entropy. For kinetics, the process of MO adsorption onto MIL-68(Al) was more suitably described by a pseudo-second-order model. Electrostatic and hydrogen-bonding interactions contributed to dye adsorption, with electrostatic interactions considered to be the principal binding force between adsorbent and adsorbate. Furthermore, MIL-68(Al) maintained a stable structure after adsorption. From these results, MIL-68(Al) was suggested here to be a stable MOF adsorbent for removing MO from aqueous solution.

scholarly journals Enhancing catalytic alkane hydroxylation by tuning the outer coordination sphere in a heme-containing metal–organic framework

2020 ◽  
Vol 11 (21) ◽  
pp. 5447-5452 ◽  
Author(s):  
David Z. Zee ◽  
T. David Harris
Keyword(s):  
Coordination Sphere ◽  
Metal Organic Framework ◽  
Alkane Hydroxylation ◽  
Metal Organic ◽  
Outer Coordination Sphere ◽  
Organic Framework

Removing labile protons via acetylation of the structural nodes in a metal–organic framework enhances catalysis at the heme linkers.

Molecular separations with breathing metal–organic frameworks: modelling packed bed adsorbers

2016 ◽  
Vol 45 (10) ◽  
pp. 4416-4430 ◽  
Author(s):  
Tom R. C. Van Assche ◽  
Gino V. Baron ◽  
Joeri F. M. Denayer
Keyword(s):  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Packed Bed ◽  
Adsorption Behavior ◽  
General Strategy ◽  
Metal Organic ◽  
Column Separations ◽  
Molecular Separations ◽  
Organic Framework

This work proposes a general strategy to model the adsorption behavior of phase changing metal–organic framework (MOF) adsorbents during column separations.

scholarly journals The silver(I) nitrate complex of the ligandN-(pyridin-2-ylmethyl)pyrazine-2-carboxamide: a metal–organic framework (MOF) structure

2017 ◽  
Vol 73 (4) ◽  
pp. 535-538 ◽  
Author(s):  
Dilovan S. Cati ◽  
Helen Stoeckli-Evans
Keyword(s):  
Hydrogen Bonds ◽  
Coordination Sphere ◽  
Title Compound ◽  
Metal Organic Framework ◽  
Nitrate Complex ◽  
Screw Axis ◽  
Metal Organic ◽  
Nitrate Anions ◽  
Silver Atoms ◽  
Organic Framework

The reaction of silver(I) nitrate with the mono-substituted pyrazine carboxamide ligand,N-(pyridin-2-ylmethyl)pyrazine-2-carboxamide (L), led to the formation of the title compound with a metal–organic framework (MOF) structure, [Ag(C11H10N4O)(NO3)]n, poly[μ-nitrato-[μ-N-(pyridin-2-ylmethyl-κN)pyrazine-2-carboxamide-κN4]silver(I)]. The silver(I) atom is coordinated by a pyrazine N atom, a pyridine N atom, and two O atoms of two symmetry-related nitrate anions. It has a fourfold N2O2coordination sphere, which can be described as distorted trigonal–pyramidal. The ligands are bridged by the silver atoms forming–Ag–L–Ag–L–zigzag chains along thea-axis direction. The chains are arranged in pairs related by a twofold screw axis. They are linkedviathe nitrate anions, which bridge the silver(I) atoms in a μ2fashion, forming the MOF structure. Within the framework there are N—H...O and C—H...O hydrogen bonds present.

Photoinduced-electron-transfer-driven surface modification to regulate adsorption behavior in a pyridinium-decorated metal–organic framework

2019 ◽  
Vol 55 (85) ◽  
pp. 12829-12832 ◽  
Author(s):  
Xiao-Dong Yang ◽  
Na Gao ◽  
Shuai Ma ◽  
Jing-Wang Cui ◽  
Meng-Ze Jia ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Surface Modification ◽  
Photoinduced Electron Transfer ◽  
Metal Organic Framework ◽  
Adsorption Behavior ◽  
Polar Molecules ◽  
Adsorption Behaviors ◽  
Metal Organic ◽  
Organic Framework

Photoinduced-electron-transfer-driven surface modification was presented in a pyridinium-decorated metal–organic framework and found to be effective to regulate its adsorption behaviors toward polar molecules and halogens.

Adsorption behavior of methylene blue on Fe3O4-embedded hybrid magnetic metal–organic framework

2016 ◽  
Vol 57 (52) ◽  
pp. 25216-25225 ◽  
Author(s):  
Yan Xu ◽  
Jingjie Jin ◽  
Xianliang Li ◽  
Chaosheng Song ◽  
Hao Meng ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Metal Organic Framework ◽  
Adsorption Behavior ◽  
Magnetic Metal ◽  
Metal Organic ◽  
Organic Framework

A Dynamic Microporous Metal–Organic Framework with BCT Zeolite Topology: Construction, Structure, and Adsorption Behavior

2007 ◽  
Vol 7 (11) ◽  
pp. 2286-2289 ◽  
Author(s):  
Sheng Hu ◽  
Jie-Peng Zhang ◽  
Hao-Xiang Li ◽  
Ming-Liang Tong ◽  
Xiao-Ming Chen ◽  
...  
Keyword(s):  
Metal Organic Framework ◽  
Adsorption Behavior ◽  
Topology Construction ◽  
Metal Organic ◽  
Organic Framework
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